Electron spin resonance spectra and hyperfine coupling constants of the α-tocopheroxyl and 2,2,5,7,8-pentamethyl-chroman-6-oxyl radicals derived from vitamin E and its model and deuterated model compounds
✍ Scribed by Mitsuyoshi Matsuo; Shigenobu Matsumoto; Toshihiko Ozawa
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 305 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Highly resolved electron spin resonance spectra of the or-tocopheroxyl or 2,2,5,7,8-pentamethylchroman-6oxyl radicals were obtained from the oxidation of cu-tocopherol (vitamin E) or its model compound, 2,2,5,7,8-pentamethyIchroman-6-01, with 2,2-diphenyl-l-picryIhydrazyl or superoxide ion. Complete assignments of the hyperfine coupling constants of these radicals were made on the basis of the spectra of the deuterated isotopomers of the 2,2,5,7,8-pentamethylchroman-6-oxyl radical. The large coupling constant due to the methyl group at C-5 in the or-tocopheroxyl radical may have implications for the high reactivity toward radicals of C-5 in a-tocopherol.